Heat control device



Oct. 18, 1932. B. H. cox ET AL 1,883,766

HEAT CONTROL DEVICE Filed Nov. 25, 1930 fizzgcejf O INVENTORS ATTORNEV'S' Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE BRYCE H. COX AND HOMER I. SNOW, OF WINSTON-SALEM, NORTH CAROLINA; SAID SNOW ASSIGNOR T SAID COX HEAT CONTROL DEVICE Application filed November 25, 1930. Serial No. 498,187.

constant.

This invention also consists in certain other features of construction and in the combina- .tion and arrangement of the several parts, to

be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a diagrammatic view, partly in section, of the invention.

Figure 2 is a sectional view showing the parts in a different position from that shown in Figure 1.

In these views, the numeral 1 indicates a spool-like supporting member for the upper and lower magnets 2 and 3, the magnets being separated by a disk 4 of non-conducting mate rial. The member 1 is supported on a cylinder 5 which in turn is supported from the valve casing 6 which forms part of a heating system. The valve 7 has its stem 8 passing through a gland 9 threaded in the top of the valve casing and the upper end of the stem passes into a small cylinder 10 arranged in the cylinder 5 and the upper end of which is connected to the lower end of arod 11 which passes through the bore of the supporting member 1. A spring 12 is arranged in the cylinder 10 and acts to firmly hold the valve on its seat when the parts are in valve closing position.

An armature 13 is located in the bore of the member 1 and encircles a part of the rod, said rod having a shoulder 14 thereon which is adapted to be engaged by the lower end of the armature and a nut 15 is threaded on the rod and is adapted to be engaged by the upper end of the armature.

Spring detents 16 are carried by the armature for holding thesame in either its lower or upper position, these detents engaging the grooves 17 in the rod. A block 18 is threaded to the upper end of the rod and operates in the top part of the bore of the member 1.

Spring detents 19 in the top part of the member 1 are adapted to engage either one of a pair of grooves 20 in the block for holding the rod and the parts carried thereby in either upper or lower position.

Switches S and S are supported on the member 1 and are insulated therefrom, each switch consisting of the parts 21 and 22 which are insulated from each other and wh ich carry the contacts 23 for engaging each other when the switch is in closed position. The part 21 of the switch S is arranged inwardly from the part 22 of said switch, while the part 21 of the switch S is located outwa rdly from its part 22. Both of these parts 21 are formed with the upper extensions which carry the adjustable members 24 which are adapted to be engaged by the frusto-conical member 25 threaded to the upper end of the rod, the parts being so arranged that when the rod is in its lowered position with the valve 7 engaging its seat, the switch S will be closed and the switch S opened. When the rod is in raised position, the head 25, engaging the members 2 1, will open the switch S and close the switch S, as shown in Figure 2. A conductor 26 connects the part 22 of the switch S with the upper magnet 2 and a conductor 27 connects the member 21 of the switch S with the lower magnet 3. A conductor 28 of a supply line is connected with the inner ends of the two magnets and the other conductor 29 of the supply line is connected with the movable arm 30 of a thermostatic device which includes the terminals 31 and 32. A conductor 33 connects the terminal 31 with the part 21 of the switch S and a conductor 34.- connects the terminal 32 with the part 22 of the switch S.

From the foregoing it will be seen that with the thermostat in neutral position, the circuit to the magnets will be broken, but if the temperature should drop to a degree where the arm 30 of the thermostatic device should con tact the terminal 31, current would flow through the upper magnet 2 through the switch S and thus said magnet would attract the armature 13 so that the armature would raise and strike the nut 14 and thus lift the rod and open the valve, the parts being held in this position by the detents 16 and 19. As the head 25 on the rod moves upwardly, it will engage the member 24: of the switch S and thus open the switch S, and through the engagement of the head 25 with the member 24 of the switch S, said switch S will be closed, as shown in Figure 2. Thus the circuit to the magnet 2 will be broken and though the switch S is closed, no current will flow to the magnet 3 as the circuit of this magnet is broken at the thermostatic device. With the parts in this position, the valve is opened so that the heating medium can pass to the radiators or other devices of the heating system to raise the temperature of the room or building in which the device is located. lVhen the temperature reaches a high degree, the arm 30 of the thermostat will engage the contact 32 so that current will pass through the switch S and the magnet 3, which will attract the armature 13 and move the same downwardly, and the pressure of the armature against the collar 14 will lower the rod 11, thus compressing the spring 12 and cause the spring to close the valve. As the rod moves downwardly, its head 25 will permit the switch S to close and the switch S to open, thus breaking the circuit of the magnet 3 and setting the parts in a position where the device will again operate when the temperature drops to a point where the thermostatic arm 30 will again engage the terminal 31.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combina tion and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What we claim is A heat control device including a thermo static switch having a pair of circuit closing positions and electrically connected to an electrical source and a control valve provided with stops on the stem thereof, a support on the valve with the stem of said valve extending therein, a spool shaped element mounted on said support, electro-magnets on the element between the ends thereof and electrically connected to the electrical source, a hollow core slidablc in said magnets to strike the stops for opening the valve, a rod extending through the magnets and core and extending into the support, a sleeve secured to the rod and slidably receiving the stem of the valve, a spring between the stem of the valve and the rod and confined in said sleeve, a self closing switch on the spool element and electrically connected to one of the magnets and to the thermostatic switch, a self 0 ening switch on said element adjacent the se f clostures.

BRYCE H. COX. HOMER I. SNOW. 

